EP 0391990 B1 19931013 - PROCESS AND INSTALLATION FOR RECOVERING AMMONIA FROM FLUE GASES
Title (en)
PROCESS AND INSTALLATION FOR RECOVERING AMMONIA FROM FLUE GASES
Publication
Application
Priority
CH 336588 A 19880908
Abstract (en)
[origin: WO9002600A1] To remove NOx? from the flue gases of a furnace, a fresh aqueous solution of ammonia (NH3?) is introduced into the flue gas stream. A superstoichiometric quantity of ammonia (NH3?) must be added in order to remove a high percentage of the NOx?. Most of the excess ammonia (NH3?) is washed out in a scrubber (6). Metered quantities of an alkaline solution, e.g., milk of lime (Ca(OH)2?), are added to the washing water in a pipe (10) connected to a stripping column (11) until a pH greater than 9.5 is attained. The ammonia (NH3?), now in physical solution, is removed from the washing water in the stripping column (11) by desorption. The mixture of steam and ammonia which leaves the stripping column (11) is condensed in a condenser (17) and the condensate, in the form of ammonium hydroxide, is mixed with the fresh ammonium hydroxide in the feed pipe (3). This results in savings in the fresh ammonium hydroxide of approximately 10 to 50 %, depending on the reduction in the NOx?.
IPC 1-7
IPC 8 full level
B01D 53/00 (2006.01); B01D 53/34 (2006.01); B01D 53/56 (2006.01); B01D 53/58 (2006.01); B01D 53/77 (2006.01); C01C 1/00 (2006.01); C01C 1/12 (2006.01); C02F 1/20 (2006.01)
CPC (source: EP US)
B01D 53/56 (2013.01 - EP US); C01C 1/12 (2013.01 - EP US)
Designated contracting state (EPC)
DE FR IT NL SE
DOCDB simple family (publication)
WO 9002600 A1 19900322; CH 677885 A5 19910715; DE 58905913 D1 19931118; EP 0391990 A1 19901017; EP 0391990 B1 19931013; JP H03500984 A 19910307; NO 175521 B 19940718; NO 175521 C 19941026; NO 902018 D0 19900507; NO 902018 L 19900507; US 5387407 A 19950207
DOCDB simple family (application)
CH 8900163 W 19890905; CH 336588 A 19880908; DE 58905913 T 19890905; EP 89909531 A 19890905; JP 50893689 A 19890905; NO 902018 A 19900507; US 52151390 A 19900508